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Outer diameter of soil layer

Outer diameter of soil layer providing a thermal resistance equivalent to $h_{soil}$.

Symbol
$D_{soil}$
Unit
m
Formulae
$D_{ext} e^{\frac{2k_4}{D_{ext} h_{soil}}}$
Related
$D_{ext}$
Overall outer diameter of pipe [m]
$h_{soil}$
Heat transfer coefficient wall-soil [W/(K.m$^2$)]
$k_4$
Thermal conductivity of soil [W/(m.K)]
Used in
$e_{soil}$
Thickness of soil layer [m]
$h_{amb}$
Pseudo film coefficient of ambient fluid at ground level [W/(K.m$^2$)]